Engine.



, P atsnted Mar. 5, I90I. E. NELSON.

E N El N E.

(Applicltion filed Mar. 8, 1900.

3 Sheets-Sheet (III:4 llod'el.)

Wn assis m: comms Pmnspo.. wom-urna., WASHINGTON. n. c.

No. 669,245. Patented mar. 5, Ism.

E. NELSON.

Exams.

(Application led Kar. 8, 1900.; (No Modal.) 3 Sheds-Shut 2.

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Patented Mar. 5, |901.

E. Nl-ipsou.

ENGINE.

f (Applicntiouled Mar. Q, 1900.y

3 Shoots-Sheet 3,

@Nmap STATES Feine..

BRICK NELSON, OF ST. PAL, MINNESOTA, ASSlGNOR OF ONE-HALF T() ANNA HELWIG, OF SAME PLACE.

ENGINE.

SPECIFIGA'ION rei-mine ma of Letters Patent No. 669.245, dated March 5, 1901'.

Application filed March 8, 1900. Serial No. '7,"791, {No model.)

To a/ZZ whom, it 11d/tty concern.'

Be it known that I, ERICK NELSON, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Portable Drilling-Machines, of which the following is a specification.

This invention relates to portable machines for operating drills and similar implements; and it consists in the construction, combination, and arrangement of parts, as hereinafter shown and described, and specifically pointed out of the claims.

In the drawings, Figure l lis a side elevation with the casing in longitudinal section. Fig. 2 is a plan view, and Fig. 3 is a sectional plan view, of the device complete. Fig. 4 is a plan view, Fig. 5 is a sectional plan view, and Fig. 6 is an end elevation, of one of the operating-cylinders detached. Fig, 7 is a side `view of the cylinder, with the valve-plug in section on the line a: a; of Fig. 6. Fig. 8 is a perspective view of the valvebushing detached. Fig. 9 is a sectional side elevation on the line y y' of Fig..3. Fig. 10 is a sectional side elevation on the line z .e of Fig. 3 with the internal gearing and connections removed.` Fig. ll is an end elevation in section on the line w w of Fig. 3. Fig. l2 is an end elevation from the feed end of the device.

A is an oblong casing, preferably of cast metal and closed at one end, as at A2, and open at The other end, as shown.

Formed centrally through the closure A2 is a circular opening b, in which a bushing fits closely, the bushing being preferably in two parts b2 b3, with the inner ends abutting against each other centrally of the opening b and with annular recesses around the adjacent ends, in which a coiled spring b4 is supported, the function of the coiled spring being to keep the two parts of the bushing pressed normally outward, as hereinafter eX- plained. This device is intended more particularly to be driven by compressed air; but steam may be employed as the motive power, if preferred.

E' B2 are two cylinders each having a stud v33 and B projet-ting centrally from one side and each stud surrounded by a sleeve B5 and B, the outer surface of each sleeve fitting into the bushings b2 b3 from op'posite sides and with the adjacent ends of the studs and sleeves abutting against'each other, as shown in Fig. 3. The outer surfaces of the sleeves B5 B6 and the inner surfaces of the bushings b2 b3 are ground, so as to tit steam or air tight against each other.

As before mentioned, while air or steam may be used as a motive power for clearness and brevity hereinafter the motive power will be referred to as compressed air.

The studs B3 B4 and their sleeves B5 B6 and the bushings b2 3 are provided with ports for the passage of the air, the studs and their sleeves thus servingas the valves by which the air is admitted to the cylinders and also as trunnions or bearings on which the cylinders oscillate.

The manner in which the ports are formed in the cylinders and valves is one of the novel features of myinvention and is described as follows:

The cylinders are each cast with a projecting rib d along one side lengthwise and centrally of the studs B3 B4, and the stud, rib, and cylinder are all cast in one piece, the stud and rib being solid or without the portpassages. Holes cl2 d3 are then drilled into the rib d' from either end, leaving a solid central portion d4 between the adjacent ends of the holes d2 d3, as shown. Similar holes cld are then bored in through the stud B3 or B4, intersecting the holes cl2 cl3, as shown. Openings Z7 d5 are then cut into the passages (Z2 d3, near their outer ends, through the side of the cylinder B or B2, to provide for the passage of the compressed air from the passages d2 d3 to the cylinder. The outer ends of the passages d2 cl3 and d5 d6 are then fitted with plugs to close their outer ends and prevent the escape of the air. Rcesses dg d10 are then cut into the plug on opposite sides and through the passages d5 d, as shown in Figs. 4, 5, 6, and 7. The sleeves B5 or BG, having been provided with porrs d CP2 cils d, as shown in Figs. S and lO, are fitted over the studs B301' B4, as shown in Figs. 3 and 10, with the ports du Z13 opposite to and leading into the recess d and the ports d12 d opposite to and leading into the recess d10, as shown in Fig. l0.

IOO

The framework or casing is formed with chambers A3 A1 on opposite sides of the inclosure A5 for the bushings b3 b3, these chambers forming the receiving and exhaust chambers alternatively, according as the machine is running forward or backward. Ports e e3 are formed through the inclosure A5 on opposite sides, and similar ports e3 c4 will be formed through the bushings b3 b3 and registering with the ports e' e3, as shown in Fig. 10. The ports e' e3 will be formed opposite each of the ports e3 efin the bushings b3 Z13, so that the compressed air will iind its way to each valve of each cylinder.

The outer sides of the cylinders are each provided with a trunnion D or D3, located centrally of the cylinder and in line with the centers of the studs B3 B3.

E E3 represent two plates secured across the framework A and covering the chambers A3 Atand with their ends curving toward each other and provided with flanges g, by ywhich they may be secured together, as shown. An end plate E3 will be secured across the ends of the plates E' E3, as shown. NVhere the anges inclose the trunnions D D3 they are formed to support the trunnious and form bearings coacting with the studs B3 B3 and their sleeves B5 B5 to support the cylinders and on which the cylinders oscillate. The plates E' E3 thus serve the threefold purpose of covers for the chambers A3 A, casings to coverand protect the cylinders and their adjacent attachments, and also providing for bearings to the cylinder, in which they are supported.

Vithin the chamber A3 is set a perforated diaphragm Ai to support a layer of waste or other absorbent material to receive the lubricating-oil fed in through an opening h and allowing it to percolate slowly downward to the valves and cylinders.

Formed in the end of the casing A', centrally between the cylinders B B3, is a stud i', in which a circular cavity c3 is formed, leading inward nearly to the line of the bushings b3 b3 and forming a seat for the combined inlet and exhaust valve, as shown. This valve consists of a main shank F', which also forms a hand-grip by which the machine may be handled and is provided with a stud F3 on its inner end, iitting into the cavity 713, and also formed with a collar t3, by which the shank and stud are supported in place by a screw-collar or gland F3, as shown in Fig. 3. By this means the valve is supported revolubly Within the framework.

The Valve F' F3 is provided with two channels 4 i5 throughout its length, one end of each channel opening outward through the outer end of the shank F' and the other ends of the channels turned in opposite directions and Opening outward through the sides of the stud F3, as shown at i 7.

113 #are ports leading from the cavity t3 into the chambers A3 A4 and registering with the outlets i5 i7 of the channels i 5 when the valve F F3 is set, as shown in Fig. 9. The channel 2"* is intended to provide means for the introduction of the compressed air, while the channel 5 is for the escape of the exhaust. The channel Z4 is shown provided with an internal screw-thread whereby the compressed-air-conducting hose may be attached.

By reference to Fig. lO it will be noted that when the cylinder Bv or B3 is set ou the center the bridges @Z13 d1 between the ports CZ (Z13 and (Z13 6Z1cu`t off the airsupply, and by increasing or decreasing the widths of these bridges the time of the cut off may be lengthened or shortened.

The bushings b3 b3 maybe so set as to p'rovide for the requisite lap or lead.

The piston-rods B7 B3 are connected to crank-pins H' H3 on crank-heads H3 H4, which are secured on opposite ends of a transverse shaft H5, journaled across the framework A', the crank-heads being set quarleriug,

shown, so that the machine will not get on the center. By this arrangement com pressed air or steam admitted to the channel Z4 will dow into the chamber A3 or A4, according as to which way the valve F F3 is turned, and from thence into the cylinder B' B3 alternately through the ports d Z13 (Z13 d1l and passages d3 d3 d5 d6 and recesses cl3 d10 and be exhausted through the channel i5, and thus actuate the pistons and revolve the shaft H5.

T0 reverse the motion of the shaft H3, it is only necessary to turn the valve F' F3 onehalf a revolution to transpose the channels 715 i4, when the air will be admitted first from the opposite side, and thus reverse the motion.

To shut off the supply of air, and thus stop the motion, it is only necessary to turn the valve F F2 one-fourth of a revolution to bring the ports @Z5/Z7 of the cavity t3 opposite the solid portions of the valve and cut off the i'low of the air.

To regulate the motion of the valve F F3, a collar F4 is attached to the shank F' outside the gland F3 and provided with two lugs F5 F6, adapted to be engaged by a stop FT, attached immovably to the end plate or cover E3 of the casing, as shown.

The distance between the adjacent sides m m3 of the lugs F5 F5 will permit the valve F F3 to be turned one-half a revolution, so that when the collar F4 is set, as shown in Fig. l2, the motion may be reversed or stopped eutirely by turning the valve one-fourth of a `revolution.

tant advantage, as it is often required to run the device in one direction only, and by set- Irc ting the stop-ring F4 so that the shorter space m2 'm4 only is in operative relation tothe stop F7 the motion cannot be inadvertently reversed.

The inner end of the stud F is formed with a cavity n', as shown in Fig. 9, and leading from this cavity into the exhaust-channel 715 is a vent/n2, while other vents 'n.2 n4 lead from a point opposite the cavity n through the wall of the inclosure A5 of the bushing b2 b2, and also through the bushings, to provide for the escape into the exhaust-channel of any leakage of the air around the sleeves B5 BG, which. might otherwise Work its Way in between the adjacent ends of the sleeves and studs B5 B6 B3 B4 and crowd the valves and the attached cylinders outward and cause an increase of friction and leakage. By this simple expedient a balance is maintained between the parts.

At the points where the ends of the shaft H5 pass through the sides of the casing A they are surrounded by and revolve in sleeves K' K2, the latter screw-threaded on their exteriors and tapped into corresponding screwthreads in the sides of the casing, as shown in Fig. 3. Jam-nuts K2 K4 serve to keep the screw-threaded sleeves locked in position in the casing. By this simple means the shaft H5 may be adjusted laterally to retain it in proper alinement with the cylinders. A pinion L is secured rigidly to the shaft H5, between the adjacent ends of the screw-collars, as shown. L2 is another transverse shaft journaled by one end L2 in the casing and fitting by a screw-thread into a sleeve L4, fixed in the opposite side of the casing A', and with a nut L5 on the end of the shaft outside the casing. The end L3 of the shaft L2 is larger than the body of the shaft, thus providing a shoulder against which the elongated hub L6 of an idler-gear L7 rests, the gear thus being supported from lateral movement between the shoulder of the head L3 and the inner face of the opposite side of the casing A', as shown.

Secured rigidly upon the extended hub L5 is a gear L2, intermeshing with the pinion L on the shaft H5, as shown.

M is a sleeve screw-threaded on its exterior, as at t', and fitting by this screw-thread into corresponding threads in the side of the casing A' and adapted to be locked in place by a jam-nut M2, as shown, and M3 is another sleeve screw-threaded on its exterior and fitting by this screw-thread in the opposite side of the casing A' and adapted to be locked in place by jam-nut t2, as shown.

Jonrnaled in the slee've M5 is a shell M4, having a tapered interior cavity and fitting by its reduced inner end into the inner end of the sleeve M, as shown, the inner end of the shell M4 abutting against balls t2 to reduce the friction to a minimum.

Projecting from the outer end of the sleeve M' is a shank M8, screw-threaded ou its exterior surface, preferably by square threads,

to secure additional strength, and adapted to receive an internally-screw-threaded backcenter M9, as shown, the latter provided with handles M10, by which it maybe more readily revolved. The shank M8 and also the rear or inner end of the shell M4 are hollow, as at a', to provide for the insertion of arod a2, as shown.

The shell M4, as before stated, has a tapered interior, as shown, and is adapted to receive the butt-end of a drill or other implement which it is designed to employ in the machine. Within the tapered socket or shell another or reducing-socket M11 may be employed for smaller drills or other implements. The inner end of the reducing-socket M11 abuts against the inner end of the driftingrod a2, as shown, while the outer end a2 of the rod projects beyond the outer end of the shell M8, so that in event of the drill becoming jammed in the socket the rod 0,2 may be utilized to force the socket or the drill outI of the shell by screwing the back-center M9 inward against it.

Upon the shell M4 is a gear M12, engaging with the pinion L7 on the shaft L2. By this arrangement the motion of the shaft H5 is transmitted through the gears L', L5, L7, and M12 to the socket-shell M4.

The forward part of the machine is covered and protected by a casing formed in two parts N N2, divided along a line running through the centers of the shafts H5 L2 and socketshell M4, the part N2 attached rigidly by one end to the inner edge of the transverse halfcasing E2 and conforming in outline thereto and further secured by screws N3 to crossbars N4 N5, connected to the sides of the casing A', as shown. The part N' of the casing is hinged at one end, as at N5, to the transverse half-casingE and secured by a thumbscrew N7 to a cross-bar NB on the casing A'. By this simple means the part N' may be turned back by merely loosening the thumbscrew N7 to expose all the running parts for oiling or inspection or for repairs. While every parl. is thus easily accessible, all the working parts are thoroughly covered and protected While in use.

By this simple device a drill or other implement may be operated in any location where it is possible to connect a back support for the back-center M2.

The construction is very compact, durable, and simple, and every part easily and quickly accessible for repairs or inspection. All of the operative parts are adjustable and renewable, so that the life7 of-the machine can be prolonged indefinitely at very small expense. All the wear of the valves of' the cylinders is between the bushings b2 b5 and the sleeves B5 B6, and these parts are easily renewable at small expense when worn. The interiors of the half-casings N N2 will be provided with ribs c c2, inclosing the outsides of the outer ends of the sides of the supporting- IOO IIO

framework'A, as shown in Figs. 1, 3, 9, and 10, to support the half-casings and prevent lateral displacement.

Having thus described my invention, what I claim as new is- 1. In a portable machine for drilling and similar purposes, a central supporting-framework, a cylindrical valve seat extending transversely of said framework and with cham bers on opposite sides within said framework, partitions connecting said cylindrical valve-seat with the walls 'of said chambers whereby said chambers are permanently divided, two cylinders having projecting' studs fitting into the opposite ends of said transverse valve-seat, said studs and cylinders provided with ports for the steam or compressed air, pistons operating Within said cylinders and having piston-rods connected to operate the actuating mechanism, and means whereby steam or compressed air may be alternately admitted to and exhausted from said permanently-divided chambers, substantially as shown and set forth.

2. In a portable machine for drilling and similar purposes, a central supporting-framework having transverse valve-seats, two cylinders having projecting studs fitting said valve-seats, and provided with ports for the steam or compressed air, pistons operating within said cylinders and having piston-rods connected to actuate the operating mechanism, closed chambers on opposite sides of said transverse valve-seats and connected thereto by combined inlet and outlet ports, a circular valve-seat adjacent to said transverse valveseat and connected by ports to said chambers, a combined inlet and exhaust valve fitting said circular valve-seat and revolubly connected therein and with extended stem, inletpassage leading through said stem and valve and registering alternately with the ports leading to said chambers, and an outlet-passage leading through said stem and valve and registering alternately with the ports leading to said chambers, substantially as shown and described. y

8. In a portable machine for drilling and similar purposes, a central supporting-framework having transverse recess, a bushing for said recess formed in two parts and forming a valve-seat, two cylinders having studs fitting said bushings and provided with ports for the steam or compressed air, pistons operating within said cylinders and having pistonrods connected to actuatea drive-shaft, closed cham bers on opposite sides of said transverse recess and its bushings, and connected thereto by combined inlet and outlet ports, and springs between the adjacent ends of said bnshingsto keep them pressed normally outward, substantially as shown and described.

4. In a portable machine for drilling and similar purposes, a central supporting-framework having transverse Valve-seats, two cylinders having projecting studs fitting said valve-seats, and provided with ports for the steam or compressed air, pistons operating within said cylinders and having piston-rods connected to actuate the operating mechanism, closed chambers on opposite sides of said transverse valve-seats and connected thereto by combined inlet and outlet ports, a circular valve-seat adjacent to said transverse valveseat and connected by ports to said cham bers, a combined'inlet and exhaust valve fitting said circular valve-seat and revolubly connected therein and with extended stem, inletpassage leading through said stem and valve and registering alternately with the ports leading to said chambers, and an outlet-passage leading through said stem and valve and registering alternately with the ports leading to said chambers, a collar upon said extended stem and having stops engaging a stop upon said framework whereby the position of the stem and valve may be controlled, substantially as shown and described.

5. In a portable machine for drilling and similar purposes, a central supporting-framework having transverse valve-seats, two cylinders having projecting studs fitting said valve seats and provided with ports for the steam or compressed air, trunnions projecting centrally from said cylinders opposite said studs, pistons operating in said cylinders and having piston-rods connected to actuate the operating mechanism, chambers on oppo site sides of said transverse valve-seat and connected thereto by combined inlet and outlet ports, combined covers for said chambers and inclosing and supporting casings for the cylinders and framework, said combined covers and casings curvinginward at their outer ends and forming bearings for said trunnions, substantially as shown and described.

6. In a portable machine for drilling and similar purposes, a central supporting-framework having transverse valve-seats, two cylinders having projecting studs fitting said valve-seats, provided with ports for the steam or compressed air, pistons operating within said cylindersand having piston-rods connected to actuate the operating mechanism, closed chambers on opposite sides of said transverse valve-seats and connected thereto IOO IIO

by combined inlet and outlet ports, a circular valve-seat adjacent to said transverse valve-seat and connected by ports to said chambers, a combined inletand exhaust valve fitting said circular valve-seat and revolubly connected therein and with extended stem, inlet-passage leading through said stem and valve and registering alternately with the ports leading to said chambers, and an outlet-passage leading through said stem andV tending to inciose the lower part. of said framework and its connections, and an upper casing-section hinged to the other one of said cylinder-cover casing-sections, whereby access may be had to the operating mechanism, substanbiaily as shown and described.

In testimony whereof I have hereunto set my hand in Iche presence of two subscribing witnesses.

ERIoK NELSON.

In presence of- AC. N. WooDwARD,

A. LINDAHL. 

